摘要
目的 了解空气—乙炔原子吸收测定锶的干扰。方法 应用单因素对比法系统研究了无机酸和部分有机酸及磷酸盐、硅酸盐对火焰原子吸收测定锶的影响 ,并研究了干扰消除方法。结果 常见的无机酸 (除硝酸 )抑制锶的吸收。大部分有机酸对锶的测定影响较小。镧能减轻或消除低浓度的盐酸、高氯酸、硫酸、铝 (| | | )、硅酸盐、磷酸盐的干扰。但镧盐的加入降低纯Sr标准溶液的信号。EDTA也能减轻上述组分对锶的干扰 ,但效果较差。钾的消电离作用并不明显。建议采用硝酸处理样品 ,饮用水和饮料中锶的测定结果令人满意。结论 采用硝酸处理样品 。
Objective To know the interference about determination of Sr in air C 2 H 2 AAS.Method The effect of inorganic acid、organic acid、PO 3- 4 and SiO 2- 3 on determination of Sr in FAAS was studied in detail by method of single factor comparison.The method of elmination interference was investigated.Results The results showed that inorganic acid suppression the Sr absorption,most of organic acid have little effect on Sr absorption.La and EDTA elminate/decrease interference of HCl、HClO\-4、H\-2、SO\-4、Al(|||)、PO 3- 4、SiO 2- 3,but La decrease absorption of Sr standard solution.EDTA not be very effective relatively.The elmination ionization of K is not necessary.The method has been applied to the determination of Sr in water and drink with satisfactory results.Conclusion HNO 3 was suggested dissolution sample.La elminate/decrease all kind of interferences.
出处
《中国公共卫生》
CAS
CSCD
北大核心
2001年第5期450-452,共3页
Chinese Journal of Public Health
关键词
锶
干扰
原子吸收
Sr
interference
atom absorption spectrometry
